Dimensions (mm): 40mm x 34mm x 10.7mm, 44mm x 38mm x 10.7mm Operating System: iOS Processor: S6 SiP with 64-bit dual-core Weight: 30.5g, 36.5g Connectivity: LTE1, Wi-Fi, Bluetooth 5.0 Storage: 32GB Battery: Up to 18 hours2, Magnetic charging cable Sensors: Fall detection Water Resistance: Up to 50m3 Additional Features: High and low heart rate notifications, Irregular heart rhythm notification4, Emergency SOS5, Compass, Always-on altimeter